What else do i need to connect to the internet?

What do i need besides this - http://www.ebay.com/itm/Apple-iMac-PowerMac-PowerBook-G4-G5-AirPort-Extreme-WiFi -Card-A1026-A1027-/220913806845?pt=US_Laptop_Network_Cards&hash=item336f7d2dfd#h t_1782wt_936 (an airport extreme card) to connect to the internet on my early 2005 power mac G5? Do I need the white T-shaped antenna? Anything else?

Here's a little about my mac-

Processor- Dual 2.7 ghz powerpc G5

Memory- 8 GB DDR SDRAM

Serial Number- G85410PZRU0

Model Number- A1047